I am planning on residing my house with hardie-plank, and I have a question on the right way to prep for it.
I currently have a 70’s ranch house with 3/4″ T-1-11 plywood siding, applied directly to the studs (no sheathing). There is 15# felt behind the T-1-11, then insulation.
I want to go over the T-1-11 with the new siding – should I put felt or house-wrap over it? I want to have a solid drainage plane, but I am concerned that if I have felt on both the back side and the front side of the plywood, it could hold some water and eventually rot.
I have thought about just taping the plywood seams with self-stick flashing tape to stop air flow and be done with it.
Note that the 30 year old plywood is in great condition – no rot, warp, cracks. I live in western Oregon (wet, colder winters)
Thanks in advance for your input.
TTF
Replies
Are you sure you have felt behind the t111?
Yup - I am sure. I have put 3 additional windows in the house, felt in all three spots.
I am with Piffen on this, use housewrap and side over.
I'd use housewrap. It is designed to breathe moisture away . It is not a vapour barrier.
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I would tape or caulk the seams, add furring strips with mesh at top and bottom and side over that. Maybe add some waterproof membrane on the lower section, especially over exposed T-111 end grain. The T-111 has served as a great drainage plane so far and the tar paper will slow any vapor or air that does get through. Plus the furring strips will help it dry before saturation even begins...
ttf
2nd the housewrap.
Rich
Thanks for the quick response on this. I think you are right - housewrap seems to make sense, since it will let any moisture out.
I also will consider furring strips to allow for air flow, and putting some membrane at the bottom to protect the T-1-11.